precedent

n.先例

pre-recorded, pre-school, pre-set, pre-shrunk, pre-stressed, pre-tax, pre-war, preach, preacher, preachy, preamble, prebend, prebendary, precarious, precariously, precariousness, precaution, precautionary, precede, precedence, precedented, preceding, precentor, precept, preceptor, precession, precinct, preciosity, precious, preciously, preciousness, precipice, precipitant, precipitate, precipitately, precipitation, precipitous, precipitously, precis, precise,